/*
 * Copyright 2007-2008 Brian Cavalier
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.bc.iterate.examples;

import org.bc.iterate.Closure;
import static org.bc.iterate.Iterate.*;

import java.net.URL;
import java.util.regex.MatchResult;
import java.util.regex.Pattern;

public class LinkExtractorExample
{
    public final static Pattern LINK_REGEX = Pattern.compile("(?:href|src)\\s*[=]\\s*[\"\']([^\"\']+)[\"\']");
    public static void main(String[] args)
    {
        if (args.length == 0) {
            System.err.println("Usage: LinkExtractorExample url");
            System.exit(1);
        }

        System.out.println("Args: " + join(args, ", "));

        try {
            each(scan(new URL(args[0]).openStream(), LINK_REGEX), new Closure<MatchResult>()
            {
                public void apply(MatchResult item)
                {
                    System.out.println(item.group(1));
                }
            });
        }
        catch (Exception e) {
            System.err.println(e);
        }
    }
}